No computers in Network Neighborhood

I have a two computers on a peer to peer network. I'm using Windos 98SE and the TCP/IP protocol. This network uses Cat5 cables with a hub. The network is working fine. I am trying to add another new computer to this network. It also uses Windows 98SE. I installed the same protocols as were on the other computers. The login and passwords are the same on all the computers. I checked the hardware lights on the hub and all three computers appear to be working. When I click on the network neighborhood on the new computer, there are no computers showing up...not even the computer itself. I can ping the new computer, from the new computer..and I get a proper response. If I try to ping the other computers from the new computer, I just get the dos screen to flash, then its gone. Currently the old comptuers on the network are still talking to one another fine. but the new computer is not seen anywhere on the network. I have also made sure on the new computer that the NIC is showing up in the network properties...it is also bound with the TCP/IP protocol, and file and printer sharing is enabled. All the settings appear to be exactly the same as the other computers. Why is this computer not showing up on the network, even to itself??

They are all in the Exact same workgroup I presume.
You may want to try installing the NetBEUI protocol on all the computers. Then unbind TCP/IP from Client for ms networks and file/print sharing which makes your lan a safer place to be anyway.

Try opening a command prompt (Start|Run and "command") and do the ping from there - that way you can see the error instead of just watching it disappear quickly.

Also, post the IP addresses and subnet masks you're using (run winipcfg on each machine). I reckon the address on your new machine isn't set up right.

When you try to ping other nodes from the new one, you say that the DOS screen flashes and disappears. THAT is wierd in itself. Take tuttle's advice and do it that way. We will at least have an error message.

If you really have a hub rather than a switch, go into the network settings for the network card and set it for 10Mbs half-duplex.

It has to match the hub port speed/duplexing and this is as fast as most hubs can manage.

Sometimes the "auto" setting just doesn't work and the hub/nic never agree on a speed so you don't get a connection.

If the speed thing fails to help, plug the PC into a port that you know is working with a cable you know is good. Hubs have been known to munch a port and cables fail. To be sure, just use the hub port and cable from a PC that is doing as it should.